Aluminum Alloy Forged Bicycle Accessories

Qinhuangdao Zhongwei Precision Machinery Co., Ltd. is a professional manufacturer of forged aluminum alloy cranks and aluminum alloy forged bicycle accessories. It has many years of experience in forging and processing aluminum alloy products. The whole process from product design, forging, machining to surface treatment and performance testing can be completed in our company, which greatly saves production costs.

Qinhuangdao Zhongwei Precision Machinery Co., Ltd. is an enterprise specializing in forging, processing and production of forgings. Products can be produced according to drawings and chemical compositions, and the integration of free forging, die forging, rough machining, heat treatment and finishing is completed. Long-term cooperation with crane, petroleum, chemical, mining, metallurgy, hydraulic, coking, train, construction machinery and other enterprises.

Product Description

1. Implementation standards: the company strictly implements ISO9001, ISO14001, IATF16949 certification

The products have passed the certification of ROHS, FDA EU, etc.

2. Product material standards: ISO, GB, ASTM, SAE, EN, DIN, BS, AMS, JIS, ASME, DMS, TOCT, GB

3. Main process: cold forging, hot forging, free forging, fetal membrane forging, die forging and special die forging. And has die casting process, investment casting, shell casting, deburring, sand blasting, machining, heat treatment, leak testing, surface treatment, etc.

4. Forging available materials:

Copper, titanium alloy, high manganese steel, high chromium steel, high nickel steel, carbon steel, aluminum alloy, alloy steel, stainless steel, gray iron, cast iron, cast steel, etc. are customized according to customer requirements.

Advantages and disadvantages of aluminum alloy forged bicycle parts

1. The advantages of aluminum alloy frame

(1) Make a light-weight frame

Aluminum is light in specific gravity but not hard enough, so it is alloyed and heat treated for strength. The heat treatment adopts the aging precipitation enhancement method, which, in short, forms a substance in the metal that hinders the deformation of the metal. When heat treatment is carried out at a certain high temperature, it will cause aging precipitation, and if the frame has not undergone this procedure, it will also cause normal temperature aging. That is to say, the frame will gradually become stronger when placed in the room. Many aluminum alloy frames are made of 6061T6 material. The T6 mark indicates heat treatment and aging. Without heat treatment, the strength can only reach 1/2 or 1/5. Bicycle parts with the 7075 logo are not strictly heat treated. That is to say, because there is no aging, it is normal temperature aging. Alloy 7075 is inherently necessary for heat treatment, and its strength can be increased by a factor of 5 through heat treatment. In addition, 7005 alloy is also commonly used to make frames. Its strength is not as strong as 7075, but it can also be aged sufficiently at room temperature. This material can also be processed into thin stock with Padded. However, the strength and Young's modulus of elasticity of the material itself are low, so the diameter of the pipe is increased to increase the rigidity.

(2) No change in appearance after long-term use

Aluminum itself is a metal that is easily corroded. There is almost no aluminum that has not been oxidized in the air. When placed in the air, it is immediately oxidized to form a very thin oxide film. Why not rust? The reason is to prevent further rusting when the oxide film reaches a certain level. The oxide film is almost colorless, so changes in appearance (sometimes whitish) are not easily seen.

On the other hand, when riding a bicycle made of this material, the more times you ride it, the more times the stress occurs, and the strength changes significantly. Recently, in order to achieve light weight, many frames are made of thin materials (the degree of thinness has reached its limit). These are framed using aluminum alloys that have no fatigue limit.

For pipes, the purpose of this machining is to prolong fatigue life. According to public data, it can be increased by 140%. KET treatment is that fatigue failure is caused by cracks that occur on the metal surface, so the hardness of the metal surface is increased by hardening processing technology.

2. Disadvantages of aluminum alloy frame

(1) Aluminum is a material with low elastic modulus and rigidity. Therefore, use thick pipes, or change the shape such as cross-over pipes, padded pipes, etc.

(2) Heat treatment is required

Heat treatment is necessary, otherwise the strength is not enough. Therefore, the general small-scale factories are unable to purchase heat treatment equipment. Especially the 6000 series aluminum alloy pipes. All manufacturers of heat treatment indicators are regarded as confidential. This also results in a variety of hardnesses.

Post Casting Process

1. Heat treatment: annealing, carbonization, tempering, quenching, normalizing, surface tempering

2. Processing equipment: CNC, WEDM, lathe, milling machine, drilling machine, grinder, etc.;

3. Surface treatment: powder spraying, chrome plating, painting, sandblasting, nickel plating, galvanizing, blackening, polishing, bluing, etc.

Moulds and Inspection Fixtures

1. Mold service life: usually semi-permanent. (except for lost foam)

2. Mold delivery time: 10-25 days, (according to product structure and product size).

3. Tooling and mold maintenance: Zhongwei is responsible for precision parts.

Quality Control

1. Quality control: the defective rate is less than 0.1%.

2. Samples and trial run will be 100% inspected during production and before shipment, sample inspection for mass production according to ISDO standards or customer requirements

3. Testing equipment: flaw detection, spectrum analyzer, golden image analyzer, three-coordinate measuring machine, hardness testing equipment, tensile testing machine;

4. Provide after-sales service.